▎ 摘　　要

NOVELTY - Reduced graphene oxide-polyethylenimine/polyvinylidene fluoride (rGO-PEI/PVDF) pyroelectric thin film comprises rGO-PEI photothermal material layer and a PVDF film layer, and the rGO-PEI photothermal material layer is fixed and attached to the surface of the PVDF film layer, transparent film layer, the PVDF film layer is a double-sided silver-coated flexible polarized PVDF film, where which beta -phase mass percentage content is higher than 90%, the surface density of the rGO-PEI photothermal material layer is 1 mg/cm2 and the rGO-PEI photothermal material contains 22.3% PEI grafting rate. USE - Used as reduced graphene oxide-polyethylenimine/polyvinylidene fluoride pyroelectric thin film. ADVANTAGE - The thin film: has simple process, economical, and is suitable for large-scale production. DETAILED DESCRIPTION - INDEPENDENT CLAIMS ar also included for preparing the pyroelectric thin film, comprising (i) using PEI as a modifier to chemically modify GO to prepare rGO-PEI photothermal material, (ii) dispersing rGO-PEI photothermal material in ethanol solution, then forming a layer of rGO-PEI photothermal material layer on the filter paper by suction filtration and drying at normal temperature to obtain rGO-PEI photothermal material layer, (iii) transferring and fixing the rGO-PEI photothermal material layer on the surface of the polarized PVDF film with a transparent film layer, and folding the edge of the transparent film layer on the other surface edge of the polarized PVDF film to form rGO-PEI/PVDF pyroelectricity film; and #self-powered bracelet based on pyroelectric thin film, comprising rGO-PEI/PVDF pyroelectric film, a copper electrode, a rectifier bridge and a capacitor, the copper electrode being connected to the surface of the PVDF film layer between the rGOPEI photothermal material layer and the PVDF film layer, and extend from the surface of PVDF membrane layer and connected to rectifier bridge and capacitor in sequence.